冻融破解预处理剩余污泥及强化微生物电解池处理效能

孙杏; 胡凯; 雷晨雨; 陈卫

doi:10.13205/j.hjgc.202104023

冻融破解预处理剩余污泥及强化微生物电解池处理效能

doi: 10.13205/j.hjgc.202104023

孙杏^1,2,
胡凯^1,2, ,,
雷晨雨^1,2,
陈卫^1,2

1. 河海大学浅水湖泊综合治理与资源开发教育部重点实验室, 南京 210098;
2. 河海大学环境学院, 南京 210098

基金项目:

中央高校科研业务费（2021B14552）；江苏高校品牌专业建设工程资助项目（PPZY2015A051）；江苏高校优势学科建设工程资助项目（PAPD）。

详细信息

作者简介:
孙杏(1996-),女,硕士研究生,主要研究方向为水处理理论与技术。1240517731@qq.com

通讯作者:
胡凯(1983-),男,副研究员,主要研究方向为污水及污泥处理及资源化技术。hukaihit@hhu.edu.cn

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出版历程
- 收稿日期: 2020-08-28
- 网络出版日期: 2021-07-21

EFFECT OF FREEZING/THAWING PRETREATMENT ON EXCESS SLUDGE DISINTEGRATION AND TREATMENT EFFICIENCY OF MICROBIAL ELECTROLYSIS CELL

SUN Xing^1,2,
HU Kai^{1,2
, ,},
LEI Chen-yu^1,2,
CHEN Wei^1,2

1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, Hohai University, Nanjing 210098, China;
2. College of Environment, Hohai University, Nanjing 210098, China

摘要

摘要: 针对微生物电解池（MEC）处理剩余污泥时水解速率慢、有机质降解率低的问题，采用冻融破解预处理剩余污泥，探讨了冻融对污泥泥质的影响及对后续MEC处理效能的强化作用。结果表明：冻融处理可以有效促进污泥絮体解散、细胞破裂及有机物溶出，在-18℃冷冻72 h，26℃融解3 h后，污泥SCOD增加了2.58倍。以冻融污泥为底物的MEC装置，在0.7 V外加电压条件下，污泥SS和TCOD去除率分别超过40%和60%。与未经处理的原泥相比，冻融处理提高了MEC装置的库伦效率和阴极H₂回收率，分别提高了5.8%和6.7%。微生物群落分析表明，冻融预处理促进了微生物电解过程中产电菌群（如变形菌门（Proteobacteria）、厚壁菌门（Firmicutes））的生长和富集，改善了剩余污泥的资源利用和能源回收效益。
- 冻融处理 /
- 剩余污泥 /
- 微生物电解池 /
- 微生物群落 /
- 污泥破解
Abstract: In this study, freezing/thawing pretreatment was adopted to disrupt sludge matrix in order to improve hydrolysis rate and degradation of organic matter in microbial electrolysis cell (MEC) feeding with excess sludge. The influence of freezing/thawing on sludge characteristics and performance of subsequent MEC was discussed. The results showed that freezing/thawing pretreatment could effectively promote the floc disintegration, cell rupture and organics dissolution of the sludge. When being freezed at -18℃ for 72 h and then thawed at 26℃ for 3 h, the SCOD content in the sludge increased by 2.58 times. At applied voltage of 0.7 V, with freezing/thawing-pretreated sludge as the substrate, the removal rates of SS and TCOD in MEC exceeded 40% and 60%, respectively. Compared with raw sludge, the pretreatment increased coulomb efficiency and cathode hydrogen recovery in MEC by 5.8% and 6.7%, respectively. Microbial community analysis showed that freezing/thawing pretreatment facilitated the enrichment of exoelectrogens (including Proteobacteria and Firmicutes) in MEC, therefore improved the overall utilization and energy recovery from excess sludge via MEC.
- freezing/thawing pretreatment /
- excess sludge /
- microbial electrolysis cell /
- microbial community structure /
- sludge disintegration

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